Passed the new 2018 exam Jan 4th, the questions were mostly scenario questions and only few simple statements.

The whizlabs 7 tests are useful to learn some of the details if it drives you to read service details and faq, but the question in the set are now simpler then the exam itself. The section tests however are pretty up to par to experience those.

I used;
The full Linux academy CSAA course and tests
The full set of aws white papers on best practices and well architected
Then worked backwards from each fault on;
Test exams on whizlabs
Test exams on acloud.Guru
Psi test exam